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Geometry Homework Help

So I need some help with a couple problems. Just need the answers lol. If you can please provide them! <3

1) The measure of an altitude of an equilateral triangle is 4 radical 3. Find the perimeter.

2) Find the length of a diagonal of a cube that has edges of length 6 inches.

6) In a right triangle, the measure of the legs are 9 and x+8 while the measure of hypothenuse is x+9. Find the value of x.

12) What is the sum of the measure of exterior angle's of a convex 15-gon?